Wire-screen stretcher and clamp



(No Modell) i `2 Sheets-Sheet 1. A. MATTSON.

WIRE SCREEN STRETGHER AND CLAMP.

Patented Aug. 2, 1887.

In Verf/Zoff n paens, Phuwmhugmvhw. minimo. nA c.

(No Model.) 2 sheets-sheen 2. A. MATTSON.

WIRE SCREEN STRBTGHBR AND CLAMP.

No. 367,538I Patented Aug. 2, 1887.

UNITED STATES PATENT OFFICE.

ANDREV MATTSON, OF MINNEAPOLIS, MINNESOTA.

WIRE-SCREEN STRETClrIER AND CLAMP.

SPECIFICATION forming p art of Letters Patent No. 367,538, dated August 2, 1887. Application inea Muy es, 15er. serial No. 239,118. (No man.)

claims.

In the drawings, which form a part of this specification, Figure l is a front elevation of `my improved clamp with the clamping-bar raised. Fig. 2 is a similar view showing the position of the parts when the clamping-bar is forced down and holding the material. Fig. is a detail of the connecting or operating rods. Fig. et is alongitudinal section to :more clearly illustrate the stretching device. 5 is a plan view of a frame with the screen stretched over it, showing the horizontal posi# tion of the stretching-screw.

In the drawings, 2 represents the side bars of the clamping-frame. These bars are connected by a bottom rail, 4, which inay be secured to an ordinary earpenters bench or to any suitable support. The bars are also connected by means of a Stringer or top bar, 6, placed at a suitable distance above the bottom bar. This bar is preferably recessed to receive the links S, which are pivoted to it. This bar is also preferably provided .with a tapering slot through the center to allow for the passage of the operatingrods 10 when the clamp is raised. Y

12 represents a clamping-bar, which slides in ways formed `in the side bars, 2. This bar is supported upon links 14, which are pivoted thereto,and also pivoted to the links 8 in such a manner that as the two sets of links 8 and 14. are straightened out the clampingbar is forced downward until it strikes the bottoni rail, 4. In order to conveniently operate these links in this way I attach the rods l0 at the elbow or the point where the links join each. other. The rods 10 are preferably so arranged that when the clamp is closed they will lie Fig.-

horizontally and be ofsnfficientlength to cause the suspension-links to assume a perpendicular position, as shown in Fig. 2, thus forming a Y double toggle-joint, exerting great pressure upon the bar and holding it locked in posi,- tion, but capable of being readily and quickly released when desired. Au arm, 16, may be attached to the rods 10 at the point where they are joined together. This arm passes through the opening in the top bar as the rods are forced down, and' by means of a handle, 1S, upon said rod the device is readily operated.

An abutment, 20, may be placed upon the under side of the cross-bar 6 to limit the motion of the links and hold them `[irmlyin working position.

22 represents a shaft provided for a portion of its Vlength with an external screw-thread, the threaded portion passing through a nut, 24:, in the bottoinrail, 4. This shaft is preferably provided with a loose collar onwasher, 26, upon its inner end, and a hand-wheel, 28,

upon its outer end.

30 are brackets upon the side frames. These brackets are for the purpose of supporting a shaft, 32, upon which a roll of wire-cloth is Wound.

34 represents the frame upon which it isi ntended to fasten the screen. The clamping bar 12 is raised and the screen or wire-cloth nnwonnd from the roll to the proper length to suit the length of the frame, and is securely fastened to the frame across the end farthest from the clamp. The clamp is then operated and the screen held rmly between the clan1ping-bar and the bottom rail, and by operating the screw 22 the frame is forced outand the screen drawn tightly over the frame, and thus held until it is securely fastened upon the three loose sides.

The relative position of the screw 22 and the frame are as shown in Fig. 5, making a pivoted point of support. The screen is properly spaced and secured at the upper end of the fran1e,and a screw being attached to the clamping-frame will hold the door in its proper position under the screen at the bottom. If, however, one side of the screen should be-slightly uneven or stretched (which is a common oc currence) as the pressure of the screw is brought to bear upon the frame, it will swing IOO erating said bar, of the screw-shaft 22,passing through a nut or Yserewthreaded opening in said bottom rail at right angles thereto, the brackets on the frame, and the shaft 82, supported upon said brackets and adapted to hold a, roll of wire cloth or screen, substantially us described.

In testimony whereof I have hereunto set my hand this 22d clay of Mny,1887.

ANDREW MATTSON. In presence of- R. II. SANFORD, A. C. PAUL,VV 

